Caesium Pellets

Formula: Cs

Form: Pellet/Lump

Material: Caesium

CAS Number: 7440-46-2

Commodity: Metals

Purity: 99.9%

Maximum Lump Size: 5mm

Melting Point: 28.5°C

Hazard Pictogram: GHS02, GHS05

Caesium Pellets offered by Goodfellow are high-purity elemental caesium shaped into small, spherical pellets. Caesium has a low melting point of 28.5°C and is extremely reactive due to its high electropositivity. The pellets are packaged under argon to prevent oxidation. Typical applications for caesium include photoelectric cells, where the metal's conductivity and photoelectron work function of 1.95 eV make it well-suited to convert light into electric current. Caesium pellets also serve as getter materials for vacuum tubes, reacting with trace gases to maintain hard vacuum environments. As part of Goodfellow's expansive metals inventory, the caesium pellets enable research and prototyping needs across sciences and engineering disciplines.

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Technical Data Sheet Safety Data Sheet Tolerance Properties

Flammable

Corrosive

each

Tolerances

Pellet/Lump

Maximum Lump Size		Nominal

Material Properties for Metals

Atomic Properties

Element	Value
Atomic number	55
Crystal structure	Body centred cubic
Electronic structure	Xe 6s¹
Valences shown	1
Atomic weight( amu )	133
Thermal neutron absorption cross-section( Barns )	29
Photo-electric work function( eV )	2.14
Atomic radius - Goldschmidt( nm )	0.27
Ionisation potential( No./eV )	1/ 3.89
Ionisation potential( No./eV )	2/ 25.10

Mechanical Properties

Element	Value
Hardness - Mohs	0.2
Material condition	Polycrystalline

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	20@20@20°C
Temperature coefficient( K⁻¹ )	0.0044@0-100°C

Physical Properties

Element	Value
Boiling point( C )	705
Density( gcm⁻³ )	1.9@20°C

Thermal Properties

Element	Value
Melting point( C )	28.5
Latent heat of evaporation( J g⁻¹ )	611
Latent heat of fusion( J g⁻¹ )	15.78
Specific heat( J K⁻¹ kg⁻¹ )	230@25°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	97@1-26°C

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Caesium Pellets

Corrosive

Tolerances

Material Properties for Metals